The best advice I can give you is to answer the questions in detail. What I did was try to answer all questions from 3 different points of view. Even when it's asking for your name, try to write more such as "My current Minecraft username is "Vanth", But feel free to call me Charlie as that is my "In real life name". And might I just state what an honour it is to have you read my application".
Something along the lines of that. I also suggest complimenting the Sr.Staff whilst writing is as everyone likes to receive compliments! Who knows, might even give you the edge you need to get to Pending!